The Precalculus, Statistics, AP Biology, AP Chemistry and AP Physics 1 gotten a lot of content added in the past year. Including new videos and a ton of practice problems with a good mastery structure. It would be awesome to see this happen to courses like Linear Algebra, AP Physics 2, Multivariable Calculus, Organic Chemistry, and so on.. These more advanced courses lack exercises and a mastery program. Some sections even lacks videos or needs a update since the quality is from 2 decades ago. It would be awesome to see changes happen to these courses.
Additionally it would be more awesome to add even more advanced courses like General chemistry, or a calculus based physics course, perhaps a introductory microbiology course? Things to help students progress from High School into College/university by giving them the oppertunity to explore more advanced topics, which would give them a headstart when they start.